Our Vampire Charger can also be thought of as a "Universal Charger."

The idea is that you have two piece of wire - in the video they are black and red, but they don't have to be marked clearly, as one of the points of this device is that you might not know which is which, so, to be clear the polarities don't matter. (At the very end of the video, after the phone turns on, Matteo switches the red and black inputs, to demonstrate this point.)

As Matteo explains in the video, the idea is that, regardless of what type of power input you have, you should be able to get enough juice to power a small USB device, such as a phone.

In our improved design, Matteo decided to not use a microcontroller. (matteo: elaborate please)

The solution is 1) a bridge rectifier (blurry picture below to replace) -

2) Then I have a buck converter (blurry picture below to replace) from about 30 volts to 4.

3) And then I have a little 4-5 here (picture needed)

As you will see now, this is sufficient to get power from DC voltages, be they 1) Car Battery 2) Boat Battery or 3) Solar Panel or 4) RC Battery even!

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